I have a problem to connect the thermostat/transistor wires to upper part of the zone valve (the picture with a red circle). I needed to replace the valve as it was leaking water. Now the new valve is on and the new cap is on ..however the wires are still dangling there ;-))
There is one wire coming from transistor - red wire
There are 3 wires coming from termostat (red, black and white). My termostat is heat only (I am heating running hot water in baseboards) so I am not sure the black wire is to be used. Can somebody pls let me know which screw of the valve cap I shall connect the wires to?. Maintenance guy told me if I do it wrong .. I might fry some part in new valve cap or termostat. Thanks a lot for your help

I have a problem to connect the thermostat/transistor wires to upper part of the zone valve (the picture with a red circle). I needed to replace the valve as it was leaking water. Now the new valve is on and the new cap is on ..however the wires are still dangling there ;-))
There is one wire coming from transistor - red wire
There are 3 wires coming from termostat (red, black and white). My termostat is heat only (I am heating running hot water in baseboards) so I am not sure the black wire is to be used. Can somebody pls let me know which screw of the valve cap I shall connect the wires to?. Maintenance guy told me if I do it wrong .. I might fry some part in new valve cap or termostat. Thanks a lot for your help

You only need the one from the transformer and two from the stat, as long as that zone valve is spring loaded return. I can't see the letters on the valve, can you tell me what they are? Paul